<template>
  <div class="article-detail__container">
    <!-- Header 区域 -->
    <van-nav-bar
      fixed
      title="文章详情"
      left-arrow
      @click-left="$router.go(-1)" />

    <div class="main-container" v-if="!loading">
        <!-- 文章信息区域 -->
      <div class="article-container">
        <!-- 文章标题 -->
        <h1 class="art-title">{{ artObj.title }}</h1>

        <!-- 用户信息 -->
        <van-cell
          center
          :title="artObj.aut_name"
          :label="$timeAgo(artObj.pubdate)">
          <template #icon>
            <img
              :src="artObj.aut_photo"
              :alt="artObj.aut_name"
              class="avatar">
          </template>
          <template #default>
            <div>
              <van-button
                v-if="artObj.is_followed"
                type="info"
                size="mini"
                @click="followOrUnfollowFn"
              >已关注</van-button>
              <van-button
                v-else
                icon="plus"
                type="info"
                size="mini"
                plain
                @click="followOrUnfollowFn"
              >关注</van-button>
            </div>
          </template>
        </van-cell>

        <!-- 分割线 -->
        <van-divider>Start</van-divider>

        <!-- 文章内容 -->
        <div
          class="art-content"
          v-html="artObj.content"
          ></div>

        <!-- 分割线 -->
        <van-divider>End</van-divider>

        <!-- 点赞 -->
        <div class="like-box">
          <van-button
            v-if="artObj.attitude === 1"
            icon="good-job"
            type="danger"
            size="small"
            @click="likeOrDislikeFn"
            >已点赞</van-button>
          <van-button
            v-else
            icon="good-job-o"
            type="danger"
            plain
            size="small"
            @click="likeOrDislikeFn"
          >点赞</van-button>
        </div>
      </div>
      <!-- 评论列表 -->
      <Comment/>
    </div>
  </div>
</template>

<script>
import {
  getArticleDetailAPI,
  followAutAPI, unfollowAutAPI,
  likeArticleAPI, dislikeArticleAPI
} from '@/api/article'
import Comment from './Comment'
export default {
  name: 'ArticleDetail',
  components: { Comment },
  data () {
    return {
      artObj: {}, // 文章详情对象
      loading: true // 网络请求的加载状态，true表示加载中
    }
  },
  async activated () {
    const box = this.$toast.loading({
      message: '加载中...',
      forbidClick: true,
      duration: 0
    })
    try {
      const resp = await getArticleDetailAPI({
        artId: this.$route.query.art_id
      })
      this.artObj = resp.data
      this.loading = false
    } catch (e) {
      this.$toast.fail({
        message: '文章不存在'
      })
      setTimeout(() => {
        this.$router.replace('/')
      }, 2000)
    } finally {
      box.clear()
    }
  },
  methods: {
    // 关注和取关
    async followOrUnfollowFn () {
      try {
        // 1. 同步到后台（调接口）
        this.artObj.is_followed
          ? await unfollowAutAPI({
            autId: this.artObj.aut_id
          }) : await followAutAPI({
            autId: this.artObj.aut_id
          })
        this.$toast.success(this.artObj.is_followed ? '取关成功' : '关注成功')
        // 2. 同步到vue变量中（更新视图）
        this.artObj.is_followed = !this.artObj.is_followed
      } catch (e) {
        this.$toast.fail(this.artObj.is_followed ? '取关出错' : '关注出错')
      }
    },
    // 点赞和取消点赞
    async likeOrDislikeFn () {
      try {
        // 1. 同步到后台（状态持久化）
        this.artObj.attitude === 1
          ? await dislikeArticleAPI({
            artId: this.artObj.art_id
          }) : await likeArticleAPI({
            artId: this.artObj.art_id
          })
        this.$toast.success(this.artObj.attitude === 1 ? '取赞成功' : '点赞成功')
        // 2. 同步到vue变量中（更新视图）
        this.artObj.attitude = this.artObj.attitude === 1 ? -1 : 1
      } catch (e) {
        this.$toast.fail(this.artObj.attitude === 1 ? '取赞出错' : '点赞出错')
      }
    }
  }
}
</script>

<style scoped lang="less">
.article-container {
  padding: 10px;
  margin-top: 46px;
}
.art-title {
  font-size: 16px;
  font-weight: bold;
  margin: 10px 0;
}

.art-content {
  font-size: 12px;
  line-height: 24px;
  width: 100%;
  overflow-x: scroll;
  word-break: break-all;
    /deep/ img{
      width: 100%;
    }
    /deep/ pre {
        white-space: pre-wrap;
        word-wrap: break-word;
    }
}

.van-cell {
  padding: 5px 0;
  &::after {
    display: none;
  }
}

.avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #f8f8f8;
  margin-right: 5px;
  border: none;
}

.like-box {
  display: flex;
  justify-content: center;
}
</style>
